// 默认缓存期限为7天
const DEFAULT_CACHE_TIME = 60 * 60 * 24 * 7

/**
 * 创建本地缓存对象
 * @param {string=} prefixKey -
 * @param {Object} [storage=localStorage] - sessionStorage | localStorage
 */
export const createStorage = ({prefixKey = '', storage = localStorage} = {}) => {
    /**
     * 本地缓存类
     * @class Storage
     */
    const Storage = class {
        private storage = storage
        private prefixKey?: string = prefixKey

        private getKey(key: string) {
            return `${this.prefixKey}${key}`.toUpperCase()
        }

        /**
         * @description 设置缓存
         * @param {string} key 缓存键
         * @param {*} value 缓存值
         * @param expire
         */
        set(key: string, value: any, expire: number | null = DEFAULT_CACHE_TIME) {
            const stringData = JSON.stringify({
                value,
                expire: expire !== null ? new Date().getTime() + expire * 1000 : null
            })
            this.storage.setItem(this.getKey(key), stringData)
        }

        /**
         * 读取缓存
         * @param {string} key 缓存键
         * @param {*=} def 默认值
         */
        get(key: string, def: any = null) {
            const item = this.storage.getItem(this.getKey(key))
            if (item) {
                try {
                    const data = JSON.parse(item)
                    const {value, expire} = data
                    // 在有效期内直接返回
                    if (expire === null || expire >= Date.now()) {
                        return value
                    }
                    this.remove(this.getKey(key))
                } catch (e) {
                    return def
                }
            }
            return def
        }

        /**
         * 从缓存删除某项
         * @param {string} key
         */
        remove(key: string) {
            console.log(key, '搜索')
            this.storage.removeItem(this.getKey(key))
        }

        /**
         * 清空所有缓存
         * @memberOf Cache
         */
        clear(): void {
            this.storage.clear()
        }

        /**
         * 设置cookie
         * @param {string} name cookie 名称
         * @param {*} value cookie 值
         * @param {number=} expire 过期时间
         * 如果过期时间为设置，默认关闭浏览器自动删除
         * @example
         */
        setCookie(name: string, value: any, expire: number | null = DEFAULT_CACHE_TIME) {
            document.cookie = `${this.getKey(name)}=${value}; Max-Age=${expire}`
        }

        /**
         * 根据名字获取cookie值
         * @param name
         */
        getCookie(name: string): string {
            const cookieArr = document.cookie.split('; ')
            for (let i = 0, length = cookieArr.length; i < length; i++) {
                const kv = cookieArr[i].split('=')
                if (kv[0] === this.getKey(name)) {
                    return kv[1]
                }
            }
            return ''
        }

        /**
         * 根据名字删除指定的cookie
         * @param {string} key
         */
        removeCookie(key: string) {
            this.setCookie(key, 1, -1)
        }

        /**
         * 清空cookie，使所有cookie失效
         */
        clearCookie(): void {
            const keys = document.cookie.match(/[^ =;]+(?==)/g)
            if (keys) {
                for (let i = keys.length; i--;) {
                    document.cookie = keys[i] + '=0;expire=' + new Date(0).toUTCString()
                }
            }
        }
    }
    return new Storage()
}



